Improvement in purifying oils which have been used in lubricating machinery



UNITED STATES PATENT OFFICE.

CHRISTOPHER HOULKER, OF FRANKFORD, PENN SYLVANIAJ IMPROVEMENT lNPURIFYING OILS WHICH HAVE BEEN USED IN LUBRICATING'MACHINERY.

Specification forming part of Letters Patent No. 110,364., datedDecember 20, 1870.

I and use the same.

My invention has for its object to furnish an improved process forcleaning or purifying petroleum oil that has been used for oilingshafting and other machinery, and which has heretofore been thrown away,so as to enable it to be again used with as much advantage as new oil; vand it consists in the process for accomplishing this, as hereinaftermore fully described and set forth.

The dirty black oil, as it runs or drips from the shafting or othermachinery, is caught, and when a sufficient quantity has been obtainedit is run through a coarse sieve. Sodaash liquor, at fifteen degrees ofthe alkalimeter,

is added to the ,oil in the proportion of five pounds of the soda-ash toforty gallons of the refuse oil. The mixture is then well agitated andallowed to settle. The oil, during the process, should be kept at atemperature of from 70 to 75 When settled the clear oil is drawn off andthe refuse at the bottom is rejected.

Having thus described my invention, I claim as new and desire to secureby Letters Patent- The process herein described for purifying orcleaning refuse petroleum lubricating-oil that has been used for oilingshafting or other machinery, as and for the purpose set forth.

CHRISTOPHER HOULKER.

Witnesses J AMES BANNISTER, THADDEUS STEARNE.

